Not sure, but as we've all played down in the MA forum (some more than others), and one can see how taxing it can be to enjoy this sport...especially down there.
I'd guess its burnout and lack of ROI (at least thats what I've struggled w/ in the past). Of course we all know to temper expectations, but we've had more than a few rugs pulled (wrt NAO, MJO and other things) not materializing as modeled. Couple that w/ a ratter pattern like last year, and for a true snow lover, its tough.
Tombo, mitch, heavy and a few other great contributors have moved on (tombo pops in when not on his forum once in a while).